Read e-book online Aquaculture and fisheries biotechnology : genetic approaches PDF

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By Rex A. Dunham

ISBN-10: 1845936515

ISBN-13: 9781845936518

The expansion cost of globally aquaculture has been sustained and swift, and the explosion of study in genetic biotechnology has made major impression on aquaculture and fisheries, even though power for a lot higher growth exists. Aquaculture and Fisheries Biotechnology covers themes necessary to the research of fish genetics, together with qualitative and quantitative characteristics, crossbreeding, inbreeding, genetic go with the flow, hybridization, choice courses, polyploidy, genomics and cloning. This absolutely up-to-date moment version additionally addresses environmental threat, nutrition security and executive rules of transgenic aquatic organisms, advertisement functions of fish biotechnology and destiny matters in fish genetics. it really is crucial examining for researchers and scholars in fish genetics and fish molecular genetics.

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Segregation distortions fluctuated with time, and variance in reproductive success was attributed to gamete quality, sperm–egg interaction and differential viability among genotypes. Sperm competition increased reproductive variance and decreased effective population size, as observed in abalone and salmon. Waldbieser and Wolters (1999) studied reproductive behaviour in channel catfish using microsatellite markers. Multiple spawning by males was found in seven of the eight ponds examined, and 47% of the males fertilized two to six egg masses over 1–8 weeks, although most were 2–3 weeks apart.

Mossambicus was an exceptionally coldsensitive species. However some reports stated that the cold tolerance of O. mossambicus is quite good. Of course, there is a wide geographic range for O. mossambicus. The strain that was stated as being cold tolerant was from South Africa. Of course, South Africa is far from the equator where this strain was subjected to a colder environment. Again, two laboratories are reaching two different conclusions for a species because of strain differences. Strain Effects on Other Breeding Programmes Strain variation is also important, since strain affects other genetic enhancement approaches, such as intraspecific crossbreeding, interspecific hybridization, sex control and genetic engineering.

At this point in time, progeny testing has not been necessary or utilized to eliminate deleterious traits in aquatic organisms. However, in terrestrial livestock progeny testing for qualitative traits can be quite important. The beef cattle industry once used a single bull – it appeared to be quite a valuable bull – that had not been properly progeny tested to impregnate cows industry-wide via artificial insemination. However, he was heterozygous, a carrier of the snorter dwarf allele. Individuals homozygous for this gene have respiratory 32 Chapter 3 problems, are dwarfs and are sterile, and often those calves will eventually die.

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Aquaculture and fisheries biotechnology : genetic approaches by Rex A. Dunham

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